57463981 has 2 divisors, whose sum is σ = 57463982. Its totient is φ = 57463980.

The previous prime is 57463979. The next prime is 57464021. The reversal of 57463981 is 18936475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34327881 + 23136100 = 5859^2 + 4810^2 .

It is a cyclic number.

It is not a de Polignac number, because 57463981 - 2¹ = 57463979 is a prime.

It is a super-2 number, since 2×57463981² = 6604218224736722, which contains 22 as substring.

Together with 57463979, it forms a pair of twin primes.

It is the 7581-st Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57463481) by changing a digit.

It is a nontrivial repunit in base 7580.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28731990 + 28731991.

It is an arithmetic number, because the mean of its divisors is an integer number (28731991).

Almost surely, 2^57463981 is an apocalyptic number.

It is an amenable number.

57463981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57463981 is an equidigital number, since it uses as much as digits as its factorization.

57463981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 57463981 is about 7580.5000494690. The cubic root of 57463981 is about 385.8915214153.

The spelling of 57463981 in words is "fifty-seven million, four hundred sixty-three thousand, nine hundred eighty-one".